Improvement in stove-grates



T. B. GRIFFITH STOVE-GRATE.

Patented Jan. 25,1876.

a. PETERS, PHGTO-LITMDGRAPHER, WASNINQTDN, ov

UNITED STATES PATENT QFFICE.

THOMAS B. GRIFFITH, or souTH'oARvE a, MASSACHUSETTS.

IMPROVEMENT IN STOVE-*GRATES.

Specification forming part of Letters Patent No. 172,564, dated January25, 1876; application filed December a, 1875.

To all whom it may concern:

Be it known that I, THOMAS B. GRIFFITH, of South Oarver, in the countyof Plymouth and State of Massachusetts, have invented certain new anduseful Improvements in Grates or Fuel-Receivers for Stoves, &c.; and Ido hereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art towhich it pertains to make and use the same, reference being had to theaccompanying drawing, and to the letters of reference marked thereon,which form a part of this specification.

In said drawing, Figure 1 denotes a front elevation, Fig. 2 a horizontalsection taken on line 00 a: of Fig. 1, Fig. 3 a longitudinal central andvertical section, and Fig. 4 a transverse central and vertical section,of a Franklin stove provided with a grate or fuel'holder constructed andapplied in accordance with my invention.

My improved device is intended for stoves, furnaces, &c., of anydesirable form.

The object of my invention is to provide a grate so constructed andapplied to a stove as to attain a more perfect and equable combustion ofthe fuel than by devices of this character as ordinarily constructed;and my invention consists in the peculiar construction of the grate andits application to a stove, as hereinafter described and claimed.

In the said drawing, A denotes the frame of an ordinary Franklin stove.B the grate or fuel-holder, whose area at its top is about one-thirdlarger than at its bottom. The grate to fit this form of stove is of acurved angular form. The end and back portions are made to taperdownward, and are formed with a series of vertical ribs or bars, a a,&c., having open spaces between them, while the front curved portion ismade with bars b, extending longitudinally and horizontally. Each of theends and back of the grate is made with an outwardly-projecting flangeor plate, 6?, extending around its upper part, such flange impingingclosely against the walls of the stove, and resting upon ledges 0 formedthereon, as shown in Figs. 3 and 4, the object of such arrangement beingto arrest the currents of air passing up on the external sides of thegrate, and cause them to be deflected inward through the openings in thesides of the grate, and into the fuel therein. 0 is the bottom of thegrate, the same being provided with journals having their bearings inthe lower part of the grate-frame, the same being to enable such part tobe tilted in the ordinary manner. Below the flanges d, and on a planenearly horizontal with the bottom of the grate, are

three flanges or plates, d, affixed to the ends and back walls of thestove, such plates extending inward toward the grate without coming incontact therewith, the object of such plates being to deflect theentering currents of air, and cause them to pass in contact with thegrate and under the bottom, as well as against sides thereof.

I would remark that the form of the stove is immaterial, as it may becircular, polygonal, or any other desired shape .in crosssection. Incase it should be of a circular or cylindrical form, the grate should beof frustoconic shape, and have a flange, d, extending entirely aroundits upper edge, to rest on ledges 0, formed on the inner face or wallsof the stove-body, and the deflecting-plate d wouldv be extendedentirely around the grate.

In front of the opening or chamber under the grate is a guard or fender,D, which is so constructed as to be adjustable, and thereby enable thevolume of air to support combustion to be regulated at will.

From the above it will be seen that by my peculiar construction of thegrate the air is brought into direct impingemenhon all its sides, andthe deflecting-plates are so arranged as to cause all the inflowingcurrents to pass into and through the fuel, while the inclinedarrangement of the gratebars allows the ashes produced by the combustionof the fuel impinging against such bars to fall through the openingsbetween them, and thereby allow the air to come in contact with theunconsumed portion of the fuel, so as better to promote its combustion.

Having described my invention, what lclaim 1s-- In a stove or furnace,the grate or fuel-holder B, formed with open and tapering sides, andwith a flange, d, extending outwardly and resting upon ledges a, formedon the inner walls of the stove, in combination with the deflectingplate or plates d, arranged on the said inner walls, as shown anddescribed, and for the purpose set forth.

F. P. HALE, F. (J. HALE.

